Electric ignition-plug.



L. A; MAZBLLIER.

ELECTRIC IGNITION PLUG.

11011101111011 FILED 11113.9, 1911.

,1 ,'O84=',808. Patented Jan. 20, 1914.

34141 emc'o'o UNITED s'rArEs PATENT OFFICE.

LEON AUGUSTE MAZELLIER, 0F ST.-PIERRE LE MOUTIER, FRANCE.

ELECTRIC IGNITION-PLUG.

Application filed February 9, 1911.

To all whom it may concern:

Be it known that 1, Leon AUeUs'rn MAznL- LIER, a citizen of the Republic of France, residingat 16 Rue de Paris, St.-Pierre le Moutier, Nievre Department, in the Repub lie of France, en ineer, have invented certain new and useful Improvements in Electric Ignition-Plugs, of whichthe following is a specification.

This invention relates to electric ignition plugs and has for its object to so construct a plug of this character as to avoid the rupture of the insulation under the influence of the expansions, and to facilitate the construction, the mounting, and the keeping in good order of its several parts.

By way of example the accompanying drawings show the essential arrangements of such plug.

Figure 1 is a sectional view'on the axial line of the plug and Fig. 2 is a bottom plan view.

1 designates a metal piece, called a socket, which is intended to be screwed into the wall of the explosion chamber of the engine. Such socket comprises, at the outside, a polygonal head and a threaded part; at the inside, a cylindrical cavity having a shoulder 2 at its upper part; the top of the head has a circular shoulder 3. The electrode consists of a rod 4 the upper part of which is threaded and of which the lower part carries an enlargedipart or shoulder 5 and a cut disk 6 which is riveted on its end.

7 designates a piece of porcelain of tubular shape, having a shoulder 8 at the outside and a shoulder 9 at the inside, so that its wall is Z shaped, in longitudinal section. Such piece is inserted from below and upward into the cavity of the socket so that the shoulders 2 and 8 impinge against each other; the electrode is another part inserted from below and upward through the piece 7 so that the shoulder 5 impinges against the shoulder 9.; the periphery of the disk 6 thus lies at a short distance from the wall I of the socket.

On theshoulder 3 is loosely embedded a cylindrical socket 10, on which is mounted a porcelain or -.1. The latter is loosely engaged in the socket and rests on the latter by means of a shoulder 12 at the outside; it. is provided with a central aperture or opening through which the electrode i-passes loosely. These several parts are held in Specification of Letters Patent.

Patented Jan. 20, 1914.. Serial No. 607,611.

place by means of a nut 13 screwed onto the electrode in such a manner as to clamp all such parts together. In order to limit such clamping and render it constant, a spiral spring 18 is interposed between the nut and the cap; such nut and the spring are housed in a cavity 19 of the cap, the bottom of which lies preferably ata short distance from theshoulder 12.

It is obvious that the piece of porcelain 7 only held at its middle and having both its ends entirely free, can expand and contract without meeting with any resistance. Such condition is obtained without having to provide in the porcelain sudden variations of thickness which give rise to rupture. Furthermore, as the planes of the shoulders 8 and 9 can be placed very near each other, the expansion of the porcelain between such planes is nil and has no influence on the relative. position of the metal pieces 1 and 5. Likewise, in placing the bottom of the cavity 19 near the plane of the shoulder 12, any influence of the expansion of the porcelain cap on. the relative position of the metal pieces 4 and 10, is avoided. The re sult is that should the pieces 4 and 10 be subjected to about the same temperature and be made of metals having about the same coeflicients of expansion, the variations of temperature would not have any material influence on the pressure to which the porcelain pieces are subjected even if the spring 18 were done away with, the nut 13then resting directly on the cap. The interposition of the spring 18 further increases the constancy of the pressure and the security.

In order to allow of the inspect-ion of the interior of the socket 10, apertures or openings 14: are provided in the latter. Such apertures or openings may be closed by means of a cylindrical screen 15 turning with a slight amount of friction on the socket 10 and provided with a long gap 16. By bringing such gap in front of both the apertures 14 as shown in the drawings, the interior of the socket 10 can be inspected, the space within-such interior being almostdark, so that it will be seen at once whether the porcelain 7 is heated to'a red heat or is giving out sparks between the electrode 4 and the top of the socket 1. Furthermore, the outer air is enabled to circulate in the socket and cool the several parts. The drawings show in dotted lines a pipe 20 formed blown into the socket by means of a flexible pipe connected with a compressed air reservoir or fan, or the like By turning the screen 15, the socket 10 can be completely closed, so as to be protected'against the water, for instance when the motor-car is being washed.

The disk 6 is preferably cut as shown in Fig. 2; it is provided with two semi-circular openings 6 and the arcs remainingon the periphery are divided by intervals 6*; the disk thus forms'a hub 6 carrying two arms 6 each of which terminates in quadrant arcs 6. That allows of obtaining sparks all around the disk, as with the electrodes having disks already known; and there is also obtained the advantage of allowing the gases to pass through the disk, which lessens the risk of greasiness, and the further advantage of being able to easily regulate the interval between the edges of the disk and the socket l; in short, the disk is open worked and is extensible. Nevertheless, the invention is not limited to this kind of electrode.

' It must be understood that such embodiment of the invention is only given by Way of example and that the forms and proportions of the several parts 'hereinbefore described may be varied while remaining within the scope of the invention. For instance, the socket '10 may be made integral with the'socket 1; the electrode may, on the other hand, be made of two or more pieces screwed or otherwise assembled together. Instead of porcelain, any other suitable material may be used for the insulation pieces 7 and 11. The spring 18 and the screen 15 may either be used or not, and obviously both the form and the arrangement of the apertures or openings in the socket 10 and in the screen 15 may be modified.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner oi Patents..-

' Washington, D. 6."

2. An ignition plug comprising a metal socket, a cylindrical socket resting on said. metal socket and having lateral openings, a jacket rotatably mounted on said cylindri cal socket and having a supply opening for the air and an opening for the escape of the air and adapted to serve as a peep hole'to the interior of the plug, tubular pieces of porcelain bearing against the top of the cylindrical socket and the bottom of the metal socket respectively, an electrode passing through said pieces, and means on the electrode for clamping said pieces on the sockets.

3. In an ignition plug, an electrode comprising a rod, a disk secured to one end of said rod, said disk being cut out to form "a hub, two diametrically -opposed arms and curved extensions extending from the end of each arm in directions concentric to the hub, thus forming together a nearly complete ring.

In testimony, that I claim the foregqing as my invention I have signed my name in presence of two subscribing witnesses.

LEON AUGUSTE MAZELLIEE.

Witnesses DEAN B. Mason, MAURICE Roux. 

